Furnace



May 22, 1923;

s. A. USHER FURNACE Filed Ju a e, 1920 2 Sheets-Sheet 1 INVENTOR r.ATTORNEY WITNESS:

May 22, 1923. 1456159 s. A. USHER I FURNACE Filed June 8, 1920 2Sheets-Sheet 2 A? l I I 20 A9 INVENTOR WITNESS. ATTORNEY Patented May22, 1923.

UNELTEQ SAMUEL ALLEN venue, or onunxv, nrssrssrrr'r.

roannon.

Application filed June 8,

T0 aZZ whom it may concern:

Be it known that I, SAMUEL ALLEN USHER, a citizen of the United States,residing at Chunky, in the county of Newton and State of Mississippi,have invented new and useful Improvements in Furnaces, of which thefollowing is a specification.

This invention relates to furnaces or fire boxes for boilers and has foran object the provision of a detachable auxiliary furnace which may beused in connection with a portable or other boiler without in any mannerchanging the structure of the boiler.

Another object is the provision of an auxiliary furnace for boilers inwhich the greatest depth of fuel will be located adjacent the boiler andthe formation of the crown of the fire box disposed so as to directproducts of combustion in a direction toward the boiler.

Another object is the provision of an auxiliary furnace for boilershaving one end constructed so as to detachably receive the end of theboiler in a manner that the latter will receive the full benefit of theheat.

With the above and other objects in view, the invention consists of thefollowing novel features and details of construction, to be hereinaftermore fully described, illustrated in the accompanying drawings andpointed out in the appended'claim.

In the drawings Figure 1 is a side elevation of a portable boilerequipped with the invention.

Figure 2 is a central vertical section taken through the auxiliaryfurnace and the ad jacent end of the boiler on an enlarged scale thesection being taken substantially on the line 22 of Figure 3.

Figure 3 is a partial horizontal section on the line 33 of Figure 2.

Figure 4 is a transverse section through the auxiliary furnace.

Referring to the drawings in detail, wherein like characters ofreference denote corresponding parts, the reference character 10indicates a portable boiler of the usual or any preferred construction.The latter is equipped with the usual fire box and is provided with afeed door 11 and an ashpit door 12 which, when the boiler is used inconnection with the auxiliary furnace are opened to permit of productsof combustion to pass through from the auxiliary furnace into theboiler.

The auxiliary furnace which comprises 1920. Serial No. 387,421.

the present invention includes side walls 13 and an end wall 1 1, thesewalls being connected by a top wall or crown 15. The walls 13, 14L and15 may be constructed of any suitable material such as brick or sheetiron and are preferably provided with a lining 16 of fiber. The end wall14 is provided with a feed opening .17 and an ashpit opening 18, both ofsaid openings being controlled by doors 19 and 20, by means of which thedraft of the furnace may also be regulated. The opposite end of thefurnace is open for the reception of the end of the boiler 10 and forthis purpose the top wall or crown 15 terminates short of the end walls13, while the said walls are also connected by an inset bar 21. The endof the boiler may thus be received Within the open end of the auxiliaryfurnace with the side walls 13 overlapping the side walls of thefurnace.

The auxiliary furnace is provided with longitudinal grate bars 22 whichextend downwardly and rearwardly toward the boiler 10 so that thegreatest fuel depth is located adjacent the boiler and consequently thegreatest amount of heat is generated at this point. In addition, the topwall or crown 15 is inclined rearwardly and downwardly toward the boiler10 so that the products of combustion are directed rearwardly throughthe doors 11 and 12. The top wall or crown 15 is preferably transverselycurved or arched and the height of this arch is located immediatelyabove the water line of the boiler when the boiler and furnace areconnected by the use of the auxiliary boiler, the heat capacity isgreatly increased so that an increased quanity of steam will result. Inaddition, the furnace may burn a fuel of green wood, the capacity of theauxiliary furnace being such as to permit of portions of the wood dryingwhile the remainder is being consumed.

The invention is susceptible of various changes in its form, proportionsand minor details of construction and the right is herein reserved tomake such changes as properly fall within the scope of the appendedclaim.

Having described the invention what is claimed is The combination with aboiler, of a re movable auxiliary furnace including a top -wall, endWall and side Walls, the latter extending beyond the end of the top Wallto receive the end of the boiler furnace Within the open end of theauxiliary furnace with the end Wall of the former abutting the edge 5 ofthe top Wall of the latter and with the side Walls of the auxiliaryfurnace overlapping the side walls of the boiler, a transverselyarranged grate supporting bar Within the auxiliary furnace and abuttingthe boiler, a grate, doors located in the end Wall 10 above and belowthe grate and an insulated I lining for the auxiliary furnace.

In testimony whereof I afiix my signature.

SAMUEL ALLEN USHER.

